I skimmed the original paper today, and they did indeed perform a follow-up experiment where participants were asked to identify themselves based on mirror imag

I skimmed the original paper today, and they did indeed perform a follow-up experiment where participants were asked to identify themselves based on mirror images. That follow-up experiment yielded similar results. No follow-up experiment was conducted for identifying mirror images of others, but it seems such an experiment would have been redundant.